X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibsystemd%2Fsd-bus%2Fbus-creds.c;h=cd1c5e232ad07a35301d1302623605a658801761;hb=15411c0cb1192799b37ec8f25d6f30e8d7292fc6;hp=8aa53362fba038cf8b14512ac10e4443e40f38c9;hpb=e12d81ae80214ef05ddedafd016bdd604ce17d12;p=elogind.git

diff --git a/src/libsystemd/sd-bus/bus-creds.c b/src/libsystemd/sd-bus/bus-creds.c
index 8aa53362f..cd1c5e232 100644
--- a/src/libsystemd/sd-bus/bus-creds.c
+++ b/src/libsystemd/sd-bus/bus-creds.c
@@ -20,14 +20,15 @@
 ***/
 
 #include <stdlib.h>
+#include <linux/capability.h>
 
 #include "util.h"
+#include "capability.h"
 #include "cgroup-util.h"
 #include "fileio.h"
 #include "audit.h"
 #include "bus-message.h"
 #include "bus-util.h"
-#include "time-util.h"
 #include "strv.h"
 #include "bus-creds.h"
 #include "bus-label.h"
@@ -50,9 +51,16 @@ void bus_creds_done(sd_bus_creds *c) {
         free(c->user_unit);
         free(c->slice);
         free(c->unescaped_description);
+        free(c->supplementary_gids);
+
+        free(c->well_known_names); /* note that this is an strv, but
+                                    * we only free the array, not the
+                                    * strings the array points to. The
+                                    * full strv we only free if
+                                    * c->allocated is set, see
+                                    * below. */
 
         strv_free(c->cmdline_array);
-        strv_free(c->well_known_names);
 }
 
 _public_ sd_bus_creds *sd_bus_creds_ref(sd_bus_creds *c) {
@@ -83,8 +91,6 @@ _public_ sd_bus_creds *sd_bus_creds_unref(sd_bus_creds *c) {
                 c->n_ref--;
 
                 if (c->n_ref == 0) {
-                        bus_creds_done(c);
-
                         free(c->comm);
                         free(c->tid_comm);
                         free(c->exe);
@@ -95,7 +101,15 @@ _public_ sd_bus_creds *sd_bus_creds_unref(sd_bus_creds *c) {
                         free(c->unique_name);
                         free(c->cgroup_root);
                         free(c->description);
+
                         free(c->supplementary_gids);
+                        c->supplementary_gids = NULL;
+
+                        strv_free(c->well_known_names);
+                        c->well_known_names = NULL;
+
+                        bus_creds_done(c);
+
                         free(c);
                 }
         } else {
@@ -132,7 +146,7 @@ _public_ int sd_bus_creds_new_from_pid(sd_bus_creds **ret, pid_t pid, uint64_t m
         int r;
 
         assert_return(pid >= 0, -EINVAL);
-        assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
+        assert_return(mask <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
         assert_return(ret, -EINVAL);
 
         if (pid == 0)
@@ -208,7 +222,7 @@ _public_ int sd_bus_creds_get_gid(sd_bus_creds *c, gid_t *gid) {
         assert_return(c, -EINVAL);
         assert_return(gid, -EINVAL);
 
-        if (!(c->mask & SD_BUS_CREDS_UID))
+        if (!(c->mask & SD_BUS_CREDS_GID))
                 return -ENODATA;
 
         *gid = c->gid;
@@ -284,18 +298,6 @@ _public_ int sd_bus_creds_get_tid(sd_bus_creds *c, pid_t *tid) {
         return 0;
 }
 
-_public_ int sd_bus_creds_get_pid_starttime(sd_bus_creds *c, uint64_t *usec) {
-        assert_return(c, -EINVAL);
-        assert_return(usec, -EINVAL);
-
-        if (!(c->mask & SD_BUS_CREDS_PID_STARTTIME))
-                return -ENODATA;
-
-        assert(c->pid_starttime > 0);
-        *usec = c->pid_starttime;
-        return 0;
-}
-
 _public_ int sd_bus_creds_get_selinux_context(sd_bus_creds *c, const char **ret) {
         assert_return(c, -EINVAL);
 
@@ -541,6 +543,28 @@ _public_ int sd_bus_creds_get_well_known_names(sd_bus_creds *c, char ***well_kno
         if (!(c->mask & SD_BUS_CREDS_WELL_KNOWN_NAMES))
                 return -ENODATA;
 
+        /* As a special hack we return the bus driver as well-known
+         * names list when this is requested. */
+        if (c->well_known_names_driver) {
+                static const char* const wkn[] = {
+                        "org.freedesktop.DBus",
+                        NULL
+                };
+
+                *well_known_names = (char**) wkn;
+                return 0;
+        }
+
+        if (c->well_known_names_local) {
+                static const char* const wkn[] = {
+                        "org.freedesktop.DBus.Local",
+                        NULL
+                };
+
+                *well_known_names = (char**) wkn;
+                return 0;
+        }
+
         *well_known_names = c->well_known_names;
         return 0;
 }
@@ -568,13 +592,14 @@ static int has_cap(sd_bus_creds *c, unsigned offset, int capability) {
         size_t sz;
 
         assert(c);
+        assert(capability >= 0);
         assert(c->capability);
 
-        sz = c->capability_size / 4;
-        if ((size_t) capability >= sz*8)
+        sz = DIV_ROUND_UP(cap_last_cap(), 32U);
+        if ((unsigned)capability > cap_last_cap())
                 return 0;
 
-        return !!(c->capability[offset * sz + (capability / 8)] & (1 << (capability % 8)));
+        return !!(c->capability[offset * sz + CAP_TO_INDEX(capability)] & CAP_TO_MASK(capability));
 }
 
 _public_ int sd_bus_creds_has_effective_cap(sd_bus_creds *c, int capability) {
@@ -618,37 +643,43 @@ _public_ int sd_bus_creds_has_bounding_cap(sd_bus_creds *c, int capability) {
 }
 
 static int parse_caps(sd_bus_creds *c, unsigned offset, const char *p) {
-        size_t sz;
-        unsigned i;
+        size_t sz, max;
+        unsigned i, j;
 
         assert(c);
         assert(p);
 
+        max = DIV_ROUND_UP(cap_last_cap(), 32U);
         p += strspn(p, WHITESPACE);
 
         sz = strlen(p);
-        if (sz % 2 != 0)
+        if (sz % 8 != 0)
+                return -EINVAL;
+
+        sz /= 8;
+        if (sz > max)
                 return -EINVAL;
 
-        sz /= 2;
         if (!c->capability) {
-                c->capability = new0(uint8_t, sz * 4);
+                c->capability = new0(uint32_t, max * 4);
                 if (!c->capability)
                         return -ENOMEM;
-
-                c->capability_size = sz * 4;
         }
 
         for (i = 0; i < sz; i ++) {
-                int x, y;
+                uint32_t v = 0;
 
-                x = unhexchar(p[i*2]);
-                y = unhexchar(p[i*2+1]);
+                for (j = 0; j < 8; ++j) {
+                        int t;
 
-                if (x < 0 || y < 0)
-                        return -EINVAL;
+                        t = unhexchar(*p++);
+                        if (t < 0)
+                                return -EINVAL;
+
+                        v = (v << 4) | t;
+                }
 
-                c->capability[offset * sz + (sz - i - 1)] = (uint8_t) x << 4 | (uint8_t) y;
+                c->capability[offset * max + (sz - i - 1)] = v;
         }
 
         return 0;
@@ -827,19 +858,6 @@ int bus_creds_add_more(sd_bus_creds *c, uint64_t mask, pid_t pid, pid_t tid) {
                 }
         }
 
-        if (missing & (SD_BUS_CREDS_PID_STARTTIME)) {
-                unsigned long long st;
-
-                r = get_starttime_of_pid(pid, &st);
-                if (r < 0) {
-                        if (r != -EPERM && r != -EACCES)
-                                return r;
-                } else {
-                        c->pid_starttime = ((usec_t) st * USEC_PER_SEC) / (usec_t) sysconf(_SC_CLK_TCK);
-                        c->mask |= SD_BUS_CREDS_PID_STARTTIME;
-                }
-        }
-
         if (missing & SD_BUS_CREDS_SELINUX_CONTEXT) {
                 const char *p;
 
@@ -923,7 +941,7 @@ int bus_creds_add_more(sd_bus_creds *c, uint64_t mask, pid_t pid, pid_t tid) {
         if (missing & SD_BUS_CREDS_AUDIT_SESSION_ID) {
                 r = audit_session_from_pid(pid, &c->audit_session_id);
                 if (r < 0) {
-                        if (r != -ENOTSUP && r != -ENXIO && r != -ENOENT && r != -EPERM && r != -EACCES)
+                        if (r != -EOPNOTSUPP && r != -ENXIO && r != -ENOENT && r != -EPERM && r != -EACCES)
                                 return r;
                 } else
                         c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
@@ -932,7 +950,7 @@ int bus_creds_add_more(sd_bus_creds *c, uint64_t mask, pid_t pid, pid_t tid) {
         if (missing & SD_BUS_CREDS_AUDIT_LOGIN_UID) {
                 r = audit_loginuid_from_pid(pid, &c->audit_login_uid);
                 if (r < 0) {
-                        if (r != -ENOTSUP && r != -ENXIO && r != -ENOENT && r != -EPERM && r != -EACCES)
+                        if (r != -EOPNOTSUPP && r != -ENXIO && r != -ENOENT && r != -EPERM && r != -EACCES)
                                 return r;
                 } else
                         c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
@@ -1020,11 +1038,6 @@ int bus_creds_extend_by_pid(sd_bus_creds *c, uint64_t mask, sd_bus_creds **ret)
                 n->mask |= SD_BUS_CREDS_TID;
         }
 
-        if (c->mask & mask & SD_BUS_CREDS_PID_STARTTIME) {
-                n->pid_starttime = c->pid_starttime;
-                n->mask |= SD_BUS_CREDS_PID_STARTTIME;
-        }
-
         if (c->mask & mask & SD_BUS_CREDS_COMM) {
                 n->comm = strdup(c->comm);
                 if (!n->comm)
@@ -1071,11 +1084,10 @@ int bus_creds_extend_by_pid(sd_bus_creds *c, uint64_t mask, sd_bus_creds **ret)
         }
 
         if (c->mask & mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) {
-                n->capability = memdup(c->capability, c->capability_size);
+                n->capability = memdup(c->capability, DIV_ROUND_UP(cap_last_cap(), 32U) * 4 * 4);
                 if (!n->capability)
                         return -ENOMEM;
 
-                n->capability_size = c->capability_size;
                 n->mask |= c->mask & mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS);
         }